Thursday, October 27, 2011

Re: Accuracy of GeoIP?

On Thu, Oct 27, 2011 at 7:38 AM, Alan <alan.illing@gmail.com> wrote:
> Does anyone have experience with the accuracy of GeoIP? I'm getting
> locations that are wildly off...
>
> When I plug in the IP from http://whatismyipaddress.com/ I get
> somewhere in the middle of Kansas when I'm in Chicago.
>
> On the other hand using a Google IP address (mentioned in the example
> below) correctly gives the lat/long of Mountain View
>
> https://docs.djangoproject.com/en/dev/ref/contrib/gis/geoip/
>
> I'm referencing data donwloaded from MaxMind:
> http://geolite.maxmind.com/download/geoip/database/
> As instructed by the link above.
>
> I didn't run into any installation problems, so I assume there's a
> data discrepancy somewhere; does anyone know of any known issues?
>
> Thanks
>

GeoIP is wildly inaccurate, particularly the free version. Using it to
predict reliably any more than the correct country is risky, and even
that fails a lot. Many GeoIP databases put me in Germany because my IP
address belongs to DeutscheTelecom and is leased to my (UK) ISP.

Cheers

Tom

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